package JavaFoundation.queuetest;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/*
题目：多线程之间按顺序调用，实现A->B->C三个线程的调用。要求如下：
    AA打印5次，BB打印10次，CC打印15次。轮询。
 */
class ShareResource{
    private int number = 1;//A:1 B:2 C:3
    private Lock lock = new ReentrantLock();
    private Condition c1 = lock.newCondition();
    private Condition c2 = lock.newCondition();
    private Condition c3 = lock.newCondition();

    public void print5(){
        lock.lock();
        try{
            //1:判断
            while (number != 1){
                c1.await();
            }
            //2:干活
            for (int i = 1; i <= 5; i++) {
                System.out.println(Thread.currentThread().getName()+"==="+i);
            }
            //3:修改标志位，并通知唤醒
            number = 2;
            c2.signal();
        }catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void print10(){
        lock.lock();
        try{
            //1:判断
            while (number != 2){
                c2.await();
            }
            //2:干活
            for (int i = 1; i <= 10; i++) {
                System.out.println(Thread.currentThread().getName()+"==="+i);
            }
            //3:修改标志位，并通知唤醒
            number = 3;
            c3.signal();
        }catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void print15(){
        lock.lock();
        try{
            //1:判断
            while (number != 3){
                c3.await();
            }
            //2:干活
            for (int i = 1; i <= 15; i++) {
                System.out.println(Thread.currentThread().getName()+"==="+i);
            }
            //3:修改标志位，并通知唤醒
            number = 1;
            c1.signal();
        }catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}

public class ConditionDemo {
    public static void main(String[] args) {
        ShareResource shareResource = new ShareResource();
        new Thread(()->{
            for (int i = 1; i <=5 ; i++) {
                shareResource.print5();
            }
        },"AAA").start();

        new Thread(()->{
            for (int i = 1; i <=5 ; i++) {
                shareResource.print10();
            }
        },"BBB").start();

        new Thread(()->{
            for (int i = 1; i <=5 ; i++) {
                shareResource.print15();
            }
        },"CCC").start();
    }
}
